Trencher power unit



FIG. 1 is a view in perspective of a tractor as seen from the front, top and one side showing our new design;

FIG. 2 is a view in perspective as seen from the rear and side opposite that shown in FIG. 1;

FIG. 3 is a view in side elevation thereof;

FIG. 4 is a view in side elevation as seen from the side opposite that shown in FIG. 3;

FIG. 5 is a view in front elevation thereof;

FIG. 6 is a view in rear elevation thereof; and,

FIG. 7 is a view in top plan view thereof.

The bottom not shown is devoid of ornamentation. 

The ornamental design for a trencher power unit, as shown and described. 